Apparatus for the delivery of measured quantities of liquid.



A. WAHL'. APPARATUS FOR THE DELIVERY OP MEASURED QUANTITIES 0F LIQUID.l

APPLICATION FILED A'PRfzo, 1911.

Patented July 11,1911.

lll :II/1

vClosing valve iS UNITED sTATEs PATENT oEEIcE.

ALFRED WAHL, 0F FREIBURGQBBEISGAU, GERMANY.

.AIPARATUS FOR THE :DELIVERY 0F MEASURED QUANTITIES' 0F LIQUID.

To all whom it may concern:

Be it known that I, ALFRED \VAHL, a subject of' the German Empire, residing lat Freiburg-inBreisgau, in Germany, have invented a certain new and useful Improved Apparatus for the Delivery of Measured Quantities of Liquid, of which the following is a specification.

This invention relates to delivery apparatus of the class wherein an automatically arranged iu a measuring chamber at the bottom of a liquid container` so that it can be opened by forcing itinward, the opening of the valve orifice being accompanied by closing of the measur-` ing chamber to the container.

The present invention. consists in constructing this valve as a differential p iston which sucks in air, during its upward movement, and positively forces out liquid during its descent.

A construction embodying this d evice is shown in the accompanying drawlngs, inl

which- Figure 1 is a central vertical section, showing the valve lowered, and Fig. 2 a similar view, showing the valve raised. Figs. 3, 4, '5 and G are cross-sections of the valve, taken on the dot and dash lines A, B, C, D of Fio'. -1.

'he apparatus comprises a measuring chamber a, open at top and bottom (the orifices being marked m and n, respectively), and a piston-valve whereof the upper part 7c is fiat-sided and is joined to a cylindrical part d. Below the latter the piston has a collar f of nearly the same diameter as the interior of the chamber a. A spring e bearing on this collar normally thrusts this piston downward against its seat, around the lower orifice n, of the chamber a, to prevent outflow of liquid. The piston has a short neck c fitting into this orifice,'integral with a handle, la In this position the measuring chamber a communicates through its upper orifice m with the container b into the lower part of which it is inserted.

When the piston is pushed upward the Specification of Letters Patent. Application led April 20, 1911.

Patented July '11, 1911. Serial No. 622,354.

especially if it should be somewhat viscous,`

tending to force it out through theoritice n, until the latter is closed by the neck c, the upper orifice lm. being at the same time opened, permitting the chamber a to again become filled with the liquid. The piston can be lifted by hand by pressure applied to t-he part r..

lVhat I claim as myinvention and` desire to secure by Letters latent of the United States is:

Apparatus for the delivery of` measured quantities of liquid, comprising a container, a measuring chamber having an inflow orifice in communication with said container and an outflow orifice at the bottom, and a piston valve in said chamber, said piston valvehaving a part adapted to fit into and close the outflow orifice and a part of larger diameter adapte( to fitvinto and close said inflow orifice, both of said valve parts having constant gl'liding engagement with the walls of their respective orifices and being so proportioned that during the initial movement of the piston the outflow orifice remains closed and the inflow orifice open, andv at a later 'stage of the same movement the inflow orifice becomes closed and the outflow orifice opened, and means to cause the return movement of the piston whereby the liquid will beforced from the measuring chamber.

In witness whereof I have signed this specification in the presence of two witnesses.

ALFRED WAHL.' Witnesses:

WILHELM BURHENN, MICHAEL KNoBLoTH. 

